#00558E
Closest named color: Dusk Blue (#26538D). oklch(43.8% 0.116 247.5), rgb(0, 85, 142).
Aa
White text reads best on this color (7.80:1).
About this color
#00558E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.116 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.019 away. White text reads best on it, at 7.80:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.68:1 |
| White text | 7.80:1 |
Values
| HEX | #00558E |
| RGB | rgb(0, 85, 142) |
| HSL | hsl(204, 100%, 28%) |
| OKLCH | oklch(43.8% 0.116 247.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #00558E | 7.80:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #00558E | 2.68:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #00558E text on white | 7.80:1 | AAA | Lc 86.5 | Fine for body text |
| #00558E text on black | 2.68:1 | Fails | Lc -15.6 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9EC5EB
oklch(80.8% 0.068 248)
-
Step 400
400
#66A6E1
oklch(70.6% 0.109 247.7)
-
Step 500
500
#368FD9
oklch(63.2% 0.139 247.5)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800 (this color)
#00558E
oklch(43.8% 0.116 247.5)
-
Step 900
900
#0E446F
oklch(37.7% 0.091 247.9)
-
Step 950
950
#0B2841
oklch(26.9% 0.058 248)
#00558E with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #385890 | 0.040 |
| Deuteranopia (no green cones) | #234D8D | 0.026 |
| Tritanopia (no blue cones) | #00636A | 0.083 |
| Achromatopsia (no color) | #525252 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00558E
#00558E
oklch(43.8% 0.116 247.5)
- #744600
#744600
oklch(43.8% 0.096 68)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #00558E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.020
- Light Navy #155084 ΔE 0.020
- Light Navy Blue #2E5A88 ΔE 0.034
- Cobalt #1E488F ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.047
- Peacock Blue #016795 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.059
Use #00558E in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.